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A positive electrode binder for tung oil-based lithium-sulfur batteries, a positive electrode for lithium-sulfur batteries, and a preparation method thereof

A lithium-sulfur battery and sulfur battery technology, applied in the field of energy polymer materials, can solve the problems of insufficient binding strength of binders, insufficient adsorption kinetics and mechanical properties, low electronic conductivity, unstable and broken electrode structures, etc.

Active Publication Date: 2021-05-07
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium-sulfur batteries have the following problems during use: (1) Lithium sulfide dissolves in the electrolyte, resulting in a shuttle effect; (2) The volume of the sulfur positive electrode continues to change during the lithiation process, causing the electrode structure to become unstable and broken; ( 3) Sulfur particles are insulators with low electronic conductivity and high resistance
However, the bond strength, adsorption kinetics, and mechanical properties of binders prepared from these raw materials are currently insufficient to meet the needs of a wide range of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of a hydrochloric acid-neutralized tung oil-based lithium-sulfur battery cathode binder, comprising the steps of:

[0031] (1) Under the action of mechanical stirring, add 3g of tungoleyl diolamine, 3.7g of isophorone diisocyanate, and 1.1g of N-methyldiethanolamine into the flask, heat it to 78°C, and make it react to obtain - NCO-terminated viscous prepolymer;

[0032] (2) After step (1) is completed, add 5 mL butanone to the solution in (1) to reduce the viscosity of the product and continue stirring;

[0033] (3) The reaction system in step (2) is lowered to room temperature;

[0034] (4) Add 0.9 g of hydrochloric acid to the prepolymer obtained in step (3), and continue stirring for half an hour;

[0035] (5) Add 30 mL of deionized water to step (4), and continue stirring at high speed for 2 hours to obtain an emulsified aqueous dispersion;

[0036] (6) After the aqueous dispersion in step (5) is subjected to rotary evaporation to remove but...

Embodiment 2

[0038] A preparation method of a phytic acid-neutralized tung oil-based lithium-sulfur battery positive electrode binder, comprising the steps of:

[0039] (1) Under the action of mechanical stirring, add 3g of tungoleyl diolamine, 3.7g of isophorone diisocyanate, and 1.1g of N-methyldiethanolamine into the flask, heat it to 78°C, and make it react to obtain - NCO-terminated viscous prepolymer;

[0040] (2) After step (1) is completed, add 5mL solvent butanone to the solution in (1) to reduce the viscosity of the product and continue stirring;

[0041] (3) The reaction system in step (2) is lowered to room temperature;

[0042] (4) Add 0.75g of phytic acid to the prepolymer obtained in step (3), and continue stirring for half an hour;

[0043] (5) Add 30 mL of deionized water to step (4), and continue stirring at high speed for 2 hours to obtain an emulsified aqueous dispersion;

[0044] (6) The aqueous dispersion in step (5) was rotary evaporated to remove butanone, and the ...

Embodiment 3

[0046] A preparation method of a lysine-neutralized tung oil-based lithium-sulfur battery positive electrode binder, comprising the steps of:

[0047] (1) Under the action of mechanical stirring, add 3g of tungoleyl diolamine, 3.7g of isophorone diisocyanate, and 1.1g of N-methyldiethanolamine into the flask, heat it to 78°C, and make it react to obtain - NCO-terminated viscous prepolymer;

[0048] (2) After step (1) is completed, add 5 mL butanone to the solution in (1) to reduce the viscosity of the product and continue stirring;

[0049] (3) The reaction system in step (2) is lowered to room temperature;

[0050] (4) Add 1.32g of lysine to the prepolymer obtained in step (3), and continue stirring for half an hour;

[0051] (5) Add 30 mL of deionized water to step (4), and continue stirring at high speed for 2 hours to obtain an emulsified aqueous dispersion;

[0052] (6) The aqueous dispersion in step (5) was rotary evaporated to remove butanone, and the positive electr...

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PUM

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Abstract

The invention belongs to the field of energy polymer materials, and specifically relates to a positive electrode binder for tung oil-based lithium-sulfur batteries, which is made of the following raw materials: 38-45 parts of tung oil-based glycol amine, 35-50 parts of diisocyanate, and 5 parts of neutralizing agent ‑20 parts and 5‑27 parts of chain extender, preparation method: (1) Mix tungoleyl diolamine, diisocyanate and chain extender evenly for reaction; (2) Add neutralizer to the obtained reaction solution for reaction ; (3) adding deionized water to the obtained neutralized product for emulsification, namely. The binder of the present invention is mixed with a conductive agent and an active material to make an electrode slurry, which is coated on a current collector to make a positive electrode of a lithium-sulfur battery, and then to prepare a lithium-sulfur battery. The binder of the present invention can improve the bonding ability, alleviate the shuttle effect in the cycle process, improve the integrity of the electrode, and further improve the long-term cycle stability, rate performance and capacity retention of the sulfur-based positive electrode and other higher-capacity electrodes, and at the same time Improve the mass specific capacity and active material loading of the electrode.

Description

technical field [0001] The invention belongs to the field of energy polymer materials, and in particular relates to an in-situ cross-linked polymerized tung oil-based lithium-sulfur battery positive electrode binder, a lithium-sulfur battery positive electrode and a preparation method thereof. Background technique [0002] Lithium-sulfur battery binder is a polymer compound. Although its mass proportion in the positive electrode material of the battery is less than 10%, its selection does directly affect the specific capacity of the battery. It is one of the indispensable materials for the preparation of electrode sheets. one. The main function of the binder is to closely connect the active material, conductive agent and current collector in the electrode, thereby reducing the impedance of the electrode, and at the same time endow the electrode with good mechanical properties and processability, which is easy to meet the needs of actual production. Lithium-sulfur batteries ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/67C08G18/32H01M4/13H01M4/139H01M4/62H01M10/052
CPCC08G18/3275C08G18/678C08G18/755H01M4/13H01M4/139H01M4/622H01M10/052Y02E60/10
Inventor 杨宇满丽敏杨卓鸿
Owner SOUTH CHINA AGRI UNIV